#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main()
{
  //fork();
  //c库函数
   printf(" hello printf ");
  fprintf(stdout," hello fprintf ");
  const char* message = " hello fwrite ";
  fwrite(message,1,strlen(message),stdout);

  //系统调用
  const char* str = " hello write\n";
  write(1,str,strlen(str));

  fork();
  return 0;
}
